Subject: Re: Does anyone have IIc power supply pinout?
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From: Rubywand <rubywand@swbell.net>
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Date: Sat, 08 May 1999 21:20:34 -0500
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Jared Falvo writes ...
> 
> I'm hoping, if I decide not to buy a genuine IIc power supply, if I can make
> or find a suitable substitute to it, assuming I use the correct type of plug
> end.  I'm hoping Radio Shack has something suitable, just requiring I put
> the proper plug on it... would a MIDI DIN plug work?  I think they use the
> same type of plugs.  Hmm...
> 
> Jared


     The info below is from the PINOUTS resource file Dr. Tom put together a few
months ago:



>>

From the Apple //c Technical Reference Manual

Section 11.2.2 The External Power Connector


The external power supply is attached to the internal converter by means
of a 7-pin DIN connector. The connector pins are identified in Figure
11-1 and Table 11-3.


Figure 11-1  External Power Connector
.     --+ +--       Pin#      Signal
.   / 7 |_| 1 \     Pin 1     Not Connected
.  | 6       2 |    Pin 2,3   Signal Ground
.   \ 5  4  3 /     Pin 4     Shield Ground
.    \_______/      Pin 5,6   +15 VDC
.                   Pin 7     Not Connected

Table 11-3   External Power Connector Signals

Pin#    Name      Description
1,7       --      Not Connected
2,3     Ground    Common Electrical Ground
4       Chassis   Chassis Ground
5,6     +15       +15-volt DC input to converter

<<


     Evidently, the job of the //c power supply module is just to deliver fairly
'raw', unregulated DC to the computer. Inside the computer would be converters
and regulators to obtain +/- 5V and +/- 12V DC.

     This is not an especially efficient approach because your hi-current supply
is going to be +5V-- roughly 10V less than the specified input V. The result,
even if you take the +5V reg's input from the +12V reg's output (for a 7V
difference), is sure to be generation of extra heat.

     Probably, //c users need to be careful about making sure the computer's air
vents are not blocked and that the computer is operated in a fairly open space.

Rubywand